662 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



nisenus angustlcollls Billings. 



Illaenua angusticollis Billings, Canadian Nat. Geo!., 4, 1859, p. 376, fig. 10; Gcol. 

 Canada, Geol. Sun-. Canada, 18G3, p. irjl, fig. I13a-<1.— Raymond and Nar- 

 raway, Ann. Carnegie Mus., 4, 1C08, p. 245, pi. 61, figs. 1-5. — Grabau and 

 Shimer, N. A. Index Fossils, 2, 1910, p. 204. 

 Black River: Island of St. Joseph, Grants Island, Lake Huron; La Petite Chau- 

 diere, Hull, Canada. 



iLLasNus ARCTURUs Hall. See Thaleops arcturus. 



nisenus arcuatu.s Billings. 



Illwnus arcuatus Billings, PaL Foss., 1, Geol. Surv. Canada, 1865, p. 279, fig. 265. 

 Chazyan (Quebec-P): Cow Head, Newfoundland. 



IIlaBnus argentlnus Kayser. 



Ilhi^nus argentinus Kayser, Zeits. d. d. geol. Gesell., 49, 1897, p. 283, pi. 7, figs. 



8, 9. 

 Ordovician: East of Jachal, San Juan, Argentina. 



Ill^nus armatus Hall. See Bumastus armatus. 



IlljENUs (Bumastus) barriensis Hall. See Bumastus ioxus. 



Illaenus bayfleldl Billings. 



Illsenus Bayfieldi Billings, Canadian Nat. Geol., 4, 1859, p. 369, figs. 4-6; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 133, fig. 65a-c. — Raymond, Ann. 



Carnegie Mus., 3, 1905, p. 348, pi. 13, figs. 11, 12; 7th Rep. Vermont State 



Geol., 1910, pi. 35, figs. 11, 12. 

 Chazyan (Mingan): Mingan Islands, Canada. 



Ill^nus chicagoensis Weller. See Bumastus chicagoensis. 



IlIvEnus clavifrons Billings. See Thaleopa clavifrons. 



Illoiuus conlfrons Billings. 



Illaenus conifrons Billings, Canadian Nat. Geol., 4, 1859, p. 378, fig. 11; Geol. 



Canada, Geol. Surv. Canada, 1863, p. 151, figs. Ilia, b. 

 Uydrolaenus coiijfrous Salter, Mon. British Tril., Pal. Soc, 18G7, p. 1S2 (gen. rcf.). 

 Chazyan (Mingan) : Mingan Islands, Canada. 



Illtrniis conradi Billings. 



lUajnus Conradi Billings, Canadian Nat. Geol., 4, 1859, p. 372, figs. 7-9; Geol. 

 Canada, Geol. Surv. Canada, 1863, p. 151, figs. llOa-c. — Vogdes, Occ. Papers 

 Caliiornia Acad. Sci., No. 4, 1893, p. 330. — Raymond ami Narraway, Ann. 

 Carnegie Mus., 4, 1908, p. 245, pi. 60, figs. 9, 10. 



Black River (Leray): Falls of La Petite Chaudiere, vicinity of Ottawa, Canada. 



Illucnus oon.slmlli.s Billings. 



llla■nu:^ con.'^imiiis Billings, Pal. Foss., 1, Geol. Siu'\'. Canada, 1865, pp. 277, 331, 

 figs. 2G3a-c, 317, 31Sa.— Grabau and Shimer, N. A. Index Fossils, 2, 1910, 

 p. 294, fig. 1604a. 

 Chazyan (Quebec — L, M, N); Point Rich and Table Head, Newfoundland. 



Illicnus con.subrlnu.s Billings. 



lUajnus consobrinus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 280, figs. 



266a, b; p. 332, footnote, figs. 320a-c. 

 Chazyan (Quebec — P): Cow Head, Newfoundland. 



